Attachment-plug.



c. 0. PLATT.

ATTACHMENT PLUG.

APPLICATION FILED MAR. 9, I915.

Patented Aug. 24,1915.

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WITNESSES INVENTOH Q Clarence fl. Platt CLARENCE D. PLATT, OF BRIDGEPOBT, CONNECTICUT.

ATTACHMENT-PLUG.

Specification of Letters Patent.

T Patented na ea, 1915.

Application filed March 9, 1915. Serial No. 13,121.

. To all whom it may concern:

Be it known that I, CLARENCE D. PLATT, a citizen of the United States, and a resident of Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Attachment-Plugs, of which ,the following is a full, clear, and exact description, whereby any one skilled in the art may make and use the same.

The invention relates to attachment plugs and more specifically to what is known in the art as a two-way attachment plug. By two-way attachment plug is meant a removable plug which may be secured to a socket or receptacle and which in turn providesa socket or receptacle for a lamp or plug member and which also has a detachable .cap member controlling a second circuit.

The object of the invention is to provide a simple, efficient device of the character described, in which direct and sure mechanical and electrical connections are provided.

A further object is to roduce a single piece insulator which carrles all of the various contact and conducting parts completely inclosing them.

A-st'ill further object is to provide for thorough ventilation and ample spacing about the contacts and conductors.

Referring to the drawings: Figure 1 is a perspective view of the device with the two-way cap removed. Fig. 2 is a perspective view looking toward the inner side of the removable cap. Fig. 3 is a central vertical section through the device. Flg. 4 is a cross-sectional view on the line 33 of Fig. 3. Fig. 5 is a bottom plan view of the detachable cap. Fig. 6 is a bottom plan View of the parts of the device. F1g. 7 1s a sectional view on the line 66 of Fig. 6. Fig. 8 is a perspective view of the unassembled parts of the spring contact arms and conductors.

It is not new in the art to provlde a twoway separable attachment plug. Such devices have usually had the body-part of the insulating member formed in two halves in order to provide for assembly and an arrangement of the contacts directly through the plug as well as for the branch conductors.

It is one of the objects of the present invention to provide a one-piece insulator so formed that the various conducting and o tact elements may be readily assembled and interlocked to give a substantial structure.

In the accompanying drawings, the numeral 1 denotes the body-part of insulating .material which has in its lower side a cylinengagement with a. yoke 10. This yokepiece 10 is arranged to fit about a central insulating boss 11 and normally rests within the bottom of a threaded sleeve contact 12.

The yoke 10 has a laterally extending I spring-contact arm 13 which projects through one of the horizontal channels such as 5 and provides one of the spring contacts for the detachable cap.

It will be seen from the above that the two threaded shells/7 and 12 are thus securely' fastened to the insulating body-part and that the spring-contact 13 with its yoke 10 is also securely fastened in place. H

Fitting within the threaded sleeve 7 there is a cylindrical insulating block 14 having arranged transversely of its. base a groove 15 which fits over the heads of the screws 8 and 9 and prevents relative rotation of the insulating member 14 and the body-part 1. Extending through this insulating block 14, and through the center of the body-part 1, there is a binding screw 15 which at its lower end engages a conductor 16 which is provided with a spring-contact member 17 which forms the central stud contact for the threaded sleeve 12. The conductor 16 has an arm 18 pro ecting into the channel 6 and extending from said arm and along the channel toward the outer face ofithe boss 4 is a spring contact member 19. The conductor 16 is struck out of sheet metal and formed to V-shape, where iltrests in a V- shaped groove 20 formed in the insulatinlg e screw 15 passes through a washer 21 and the head of the screw with the washer forms a center stud contact cooperating with thethreaded sleeve A direct electrical connection is made through the screw 15 with the conductor 16 and spring contact member 17 which latter serves as the central stud contact for the threaded sleeve 12.

It will be noted that the two sleeves 7 and 12 are electrically connected and through the yoke 10 and spring contact member 13 provide a terminal for the removable cap 22. I

The centralstud contact 21 is member 17 of the shell 12 and through the conductor 16,- arm 18 and spring eontaet member 9 provides the second terminal for the removable cap 22. I v

Allthe connections between the central stud contact 21 and its sleeve 7 and the ce tral stud or spring contact 17 and its sleeve 12 are direct from end to end of the insulating body-part. Therefore, there is no tendency for twisting or warping andthc parts may be firmly and positively set together without liability of breaking the frangible insulator.

In Fig. 8, the method of connecting the conductor and its, arm to the spring contact member ofthe branch circuit is illustrated. The contact members 13 are accurately struck .up in dies so that they are absolutely uniform. The conductors (Fig. 8 showing I the yoke 10) are also struck up in dies. The

arm extending from the yoke 10 has a rectangular boss 10 formed by punching up themetal and the spring arm 13 has a similarly formed opening 13?. The opening 13 is arranged over the boss 10 and the latter is, then .peened down or. riveted, thus forming a joint which has no tendency to turn or loosen. a a,

v The ca member 22 is provided with contact mem ers 23, 24 which engage the sprin contacts 5 and 6, the spring, contacts an the contacts of the cap being so formed as to interloclc Each: of the contacts 23, 24 is providedwith binding screws'25 by which circuit wires may be attached to the removable cap 22 in the ordinary well lmown manner. p v p 7 It will be observed that the yoke member '10 rests upon a solid base and has a substantial arm extending into-the channel 5 and supporting the spring contact 13, all these .parts being substantially at right'angles to each, other. It will also be 0 served that the conductor 16 is firmly seated and clamped in the V-shapedslot of the 11 and has an arm at right angles extending into the channel 6 with its spring arm pro jecting therealong. Inasmuch as all of these parts can e firmly and positively clamped toether by direct connections, a structure .0 unusual stabilit is provided. 7

It will be noted that the c 'annels 5 and 6 I directly-1 connected with the central stud contact n- 15 'areemparatively large and open directly and has forone of its objects the provision of very substantial continuous conductor pieces and spring contacts arranged in ample chambers to give perfect ventilation and freedom from moisture. What I claim as to secure Letters Patent is: 7

my invention and desire 1; In an attachment plug, a single piece insulating body-part having a bossextending from one side thereof, ac lindrical cavity havinga central raised insulating stud-at its base, channels extending through the boss and conne'ctingwith the central cavity on opposite sides of the central insulatingboss,

a spring contact extending into oneof said channels and seated upon said boss, a spring 7 contact in the other of said channels seated within a threaded sleeve contact having a yoke projecting into the cylindrical openlng and seated within threaded sleeve contact,

a threaded sleeve clamped in said e li' dri cal opening by said yoke, a threaded sleeve seated upon the opposite end of the bodypart and clamped tothe yoke and threaded sleeve ofthe cylindricalopening, an insulat ing plug arranged within said sleeve and a central stud clamping said insulating plug and thecontactmember seatediupon the boss of the cylindrical opening.

2. In an attachment plug, a single piece insulating body-part having a central cylindrical opening and a at one side thereof, substantially large channels extending horizontally through said boss and communicating with the central cylindrical opening on opposite sides of its center, a contactseat extending from the baseof the cylindrical opening between the horizontal channels, a conductor sea-ted upon said boss and having a spring contact arm projecting through one of the channels, a threaded sleeve contact seated in the cylindrical opening, a yoke member clamping the threaded sleeve contact, a threaded sleeve contact seated upon the upper end of the insulating body part, means for clamping said sleeve and the threaded sleeve and yoke together to the body-part, an insulating plug within the threadedsleeve and; a, central stud contact cooperating with said sleeve and connected with the conductor seated upon the central insulating of thecylindrical o 'iening. 3. In anattachment plug, a 'singleplece insulating body-part havingacentral cylindrical opening for a threaded sleeve contact and central stud contact at one end and a seat for a. threaded sleeve contact and cylindrical stud contact at its opposite end, substantially wide channels extending transversely through the body-part and communicating with the cylindrical opening, spring contacts arranged therein and having conductors connecting respectively with the central stud contact and the sleeve contact of the cylindrical opening whereby a free circulation of air is provided about said parts and clamping devices forming connections between the central stud conductor of the cylindrical opening and the central stud contact at the opposite end of the device and clamping devices intermediate the threaded sleeve contact of the cylindrical opening and the threaded sleeve contact at the opposite end of the device.

4. An attachment plug having a single piece insulating body-part with a cylindrical opening at one end and a seat at the opposite end 'for the reception of threaded sleeve contacts, a 'boss of insulating material having an angularly formed seat, said,

boss centrally disposed with reference to the cylindrical opening, a pair of threaded sleeve contacts clamped together and arranged respectively in the cylindrical opening and seat at the end of the body-part, an insulating plug varranged in the threaded sleeve seated at the end of the plug, a central stud contact extending through said insulating plug and in screw engagement with a central stud contact seated upon the angularly formed insulating plug, channels extending transversely into the body of the the threaded sleeve contact of the cylindrical opening.

5. In a device of the character described having a threaded sleeve and central stud contact seated at one end of a single piece insulating body-part, a threaded sleeve and central stud contact seated in a cylindrical opening at the opposite end of said bodypart, a yoke for clamping the latter threaded sleeve within the cylindrical opening and provided with a transverse arm having an angularly formed boss protruding from one side thereof, a spring contact having a perforation fitting said boss, a channel extending through the side of the body-part and into the cylindrical opening to receive said yoke and its spring arm, a central stud contact having anarm provided with an angularly formed boss and a spring contact arm provided with an opening fitting said boss and arranged to be inserted in the second of said transverse channels, a cap and contacts for engaging said spring arms and clamping and conducting screws connecting the respective threaded sleeve contacts and central stud cont-act members and clamping the spring arm contacts of the transverse channels to the body-part.

I CLARENCE D. PLATT.

Witnesses:

CHRISTI NELSON, GEORGE N. SEARS. 

